<!DOCTYPE html>
<html>
<head>
<title>test ws connection</title>
<script>

const query = new URL(location.href).searchParams;

async function test() {
  try {
    const port = query.get('port');
    const ws = new WebSocket(`ws://127.0.0.1:${port}/check-origin`);
    const ev = await new Promise((resolve, reject) => {
      ws.onmessage = resolve;
      ws.onclose = reject;
    });
    if (ev.data == 'file://') {
      document.title = 'FILE';
    } else if (ev.data == 'null') {
      document.title = 'NULL';
    } else {
      document.title = 'FAIL';
    }
  } catch (e) {
    document.title = 'FAIL';
  }
}

test();

</script>
</head>
</html>
